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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: CopyState.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.primitives.Ints;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Arrays;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Map;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.TreeMap;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.core.ObjId;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.util.ObjIdSet;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>/**<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Keeps tracks of which objects have already been copied when copying objects between transactions.<a name="line.20"></a>
<span class="sourceLineNo">021</span> *<a name="line.21"></a>
<span class="sourceLineNo">022</span> * @see JObject#copyTo JObject.copyTo()<a name="line.22"></a>
<span class="sourceLineNo">023</span> * @see JTransaction#copyTo(JTransaction, JObject, ObjId, CopyState, String...) JTransaction.copyTo()<a name="line.23"></a>
<span class="sourceLineNo">024</span> */<a name="line.24"></a>
<span class="sourceLineNo">025</span>public class CopyState implements Cloneable {<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>    private final TreeMap&lt;int[], ObjIdSet&gt; traversedMap = new TreeMap&lt;&gt;(Ints.lexicographicalComparator());<a name="line.27"></a>
<span class="sourceLineNo">028</span>    private /*final*/ ObjIdSet copied;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    /**<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * Default constructor.<a name="line.31"></a>
<span class="sourceLineNo">032</span>     */<a name="line.32"></a>
<span class="sourceLineNo">033</span>    public CopyState() {<a name="line.33"></a>
<span class="sourceLineNo">034</span>        this(new ObjIdSet());<a name="line.34"></a>
<span class="sourceLineNo">035</span>    }<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>    /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * Constructor to use when a set of known objects has already been copied.<a name="line.38"></a>
<span class="sourceLineNo">039</span>     *<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * @param copied the ID's of objects that have already been copied<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * @throws IllegalArgumentException if {@code copied} is null<a name="line.41"></a>
<span class="sourceLineNo">042</span>     */<a name="line.42"></a>
<span class="sourceLineNo">043</span>    public CopyState(ObjIdSet copied) {<a name="line.43"></a>
<span class="sourceLineNo">044</span>        if (copied == null)<a name="line.44"></a>
<span class="sourceLineNo">045</span>            throw new IllegalArgumentException("null copied");<a name="line.45"></a>
<span class="sourceLineNo">046</span>        this.copied = copied.clone();<a name="line.46"></a>
<span class="sourceLineNo">047</span>        synchronized (this) { }<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    /**<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * Determine if an object has already been copied, and if not mark it so.<a name="line.51"></a>
<span class="sourceLineNo">052</span>     *<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * @param id object ID of object being copied<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * @return true if {@code id} was not previously marked copied, otherwise false<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * @throws IllegalArgumentException if {@code id} is null<a name="line.55"></a>
<span class="sourceLineNo">056</span>     */<a name="line.56"></a>
<span class="sourceLineNo">057</span>    public boolean markCopied(ObjId id) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>        if (id == null)<a name="line.58"></a>
<span class="sourceLineNo">059</span>            throw new IllegalArgumentException("null id");<a name="line.59"></a>
<span class="sourceLineNo">060</span>        return this.copied.add(id);<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>    /**<a name="line.63"></a>
<span class="sourceLineNo">064</span>     * Determine if the specified reference path has already been traversed starting at the given object, and if not mark it so.<a name="line.64"></a>
<span class="sourceLineNo">065</span>     *<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * @param id object ID of object being copied<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * @param fields reference path storage IDs<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * @return true if {@code fields} was not previously marked as traversed from {@code id}, otherwise false<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * @throws IllegalArgumentException if either parameter is null<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @throws IllegalArgumentException if {@code fields} has length zero<a name="line.70"></a>
<span class="sourceLineNo">071</span>     */<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public boolean markTraversed(ObjId id, int[] fields) {<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>        // Sanity check<a name="line.74"></a>
<span class="sourceLineNo">075</span>        if (id == null)<a name="line.75"></a>
<span class="sourceLineNo">076</span>            throw new IllegalArgumentException("null id");<a name="line.76"></a>
<span class="sourceLineNo">077</span>        if (fields == null)<a name="line.77"></a>
<span class="sourceLineNo">078</span>            throw new IllegalArgumentException("null fields");<a name="line.78"></a>
<span class="sourceLineNo">079</span>        if (fields.length == 0)<a name="line.79"></a>
<span class="sourceLineNo">080</span>            throw new IllegalArgumentException("empty fields");<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span>        // Mark the path, and all prefixes of the path, as having been traversed<a name="line.82"></a>
<span class="sourceLineNo">083</span>        boolean fullPath = true;<a name="line.83"></a>
<span class="sourceLineNo">084</span>        for (int limit = fields.length; limit &gt; 0; limit--) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>            final int[] prefix = fullPath ? fields : Arrays.copyOfRange(fields, 0, limit);<a name="line.85"></a>
<span class="sourceLineNo">086</span>            ObjIdSet idSet = this.traversedMap.get(prefix);<a name="line.86"></a>
<span class="sourceLineNo">087</span>            if (idSet == null) {<a name="line.87"></a>
<span class="sourceLineNo">088</span>                idSet = new ObjIdSet();<a name="line.88"></a>
<span class="sourceLineNo">089</span>                this.traversedMap.put(prefix, idSet);<a name="line.89"></a>
<span class="sourceLineNo">090</span>            }<a name="line.90"></a>
<span class="sourceLineNo">091</span>            if (!idSet.add(id))                         // we have already marked this prefix (and every shorter prefix)<a name="line.91"></a>
<span class="sourceLineNo">092</span>                return !fullPath;<a name="line.92"></a>
<span class="sourceLineNo">093</span>            fullPath = false;<a name="line.93"></a>
<span class="sourceLineNo">094</span>        }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>        // Done<a name="line.96"></a>
<span class="sourceLineNo">097</span>        return true;<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>// Cloneable<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span>    @Override<a name="line.102"></a>
<span class="sourceLineNo">103</span>    public CopyState clone() {<a name="line.103"></a>
<span class="sourceLineNo">104</span>        final CopyState clone;<a name="line.104"></a>
<span class="sourceLineNo">105</span>        try {<a name="line.105"></a>
<span class="sourceLineNo">106</span>            clone = (CopyState)super.clone();<a name="line.106"></a>
<span class="sourceLineNo">107</span>        } catch (CloneNotSupportedException e) {<a name="line.107"></a>
<span class="sourceLineNo">108</span>            throw new RuntimeException(e);<a name="line.108"></a>
<span class="sourceLineNo">109</span>        }<a name="line.109"></a>
<span class="sourceLineNo">110</span>        for (Map.Entry&lt;int[], ObjIdSet&gt; entry : this.traversedMap.entrySet())<a name="line.110"></a>
<span class="sourceLineNo">111</span>            clone.traversedMap.put(entry.getKey(), entry.getValue().clone());<a name="line.111"></a>
<span class="sourceLineNo">112</span>        clone.copied = this.copied.clone();<a name="line.112"></a>
<span class="sourceLineNo">113</span>        return clone;<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span>}<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>




























































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